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Experimental and numerical study on the bending performances of glass FRP molded gratings: Influence of restraining conditions and cover plates

机译：玻璃纤维增​​强塑料成型格栅弯曲性能的实验和数值研究：约束条件和盖板的影响

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The results of experimental bending tests on full-scale, molded FRP (Fiber Reinforced Plastics) gratings are reported and discussed in the paper. In particular, different boundary conditions (perimeter support, two edges support and point support at corners) and the influence of FRP cover applied at one or both sides are investigated and the performances are compared in terms of stiffness and resistance. The collaboration of the ribs in the two directions to the load-carrying capacity clearly emerged in open gratings, which typically collapsed for the tensile failure of the ribs at the mid span. The shear sliding of perimeter ribs was also observed in some cases. The presence of the covers increases both the stiffness and the resistance performances of the samples, however premature failure due to punching shear and cover delamination with buckling occurred.A finite element numerical model was developed to investigate on the stress and strain state of the gratings at both service level and failure: it was validated by comparison with the experimental tests and it is useful for future investigations on more complex configurations.
机译：本文报道并讨论了在完整尺寸的模制FRP（纤维增强塑料）光栅上进行的实验弯曲测试的结果。特别是，研究了不同的边界条件（边界支撑，两个边缘支撑和拐角处的点支撑）以及在一侧或两侧施加FRP覆盖物的影响，并根据刚度和阻力比较了性能。肋骨在两个方向上与承载能力的协作明显出现在开放式格栅中，通常由于肋骨在中跨处的拉伸破坏而塌陷。在某些情况下，还观察到周边肋骨的剪切滑动。覆盖层的存在增加了样品的刚度和抗力性能，但是由于冲剪和覆盖层的屈曲而导致过早失效。建立了一个有限元数值模型来研究光栅在应力作用下的应力和应变状态。服务级别和故障：通过与实验测试的比较进行了验证，对于将来对更复杂的配置进行调查很有用。

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